chore(npm/react): migrate to @packages/eslint-config

[jennifer-shehane]

Additional details

Migrates npm/react (Batch 2: Framework adapters) to the shared ESLint setup per guides/eslint-migration.md.

Summary

• Removed: .eslintrc, .eslintignore
• Added: eslint.config.ts extending @packages/eslint-config with package-specific overrides (Cypress globals for cypress/**, no-console / mocha/no-global-tests / react/prop-types / react/display-name off, allowDefaultProject for TS). Ignore patterns moved into the flat config.
• Updated: package.json — added devDependencies @packages/eslint-config, eslint, jiti; set "lint": "eslint"; added lint-staged for **/*.{js,jsx,ts,tsx}.

Checklist

• Removed old ESLint config (.eslintrc) and migrated ignores into eslint.config.ts
• Added eslint.config.ts with shared config + overrides
• Added required deps (eslint, @packages/eslint-config, jiti) and lint-staged
• Updated lint script (dropped --ext)
• Ran npx eslint . --fix in npm/react (exit 0, no errors)

Migration guide

• guides/eslint-migration.md — Batch 2: npm/react marked completed.

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Note

Low Risk
Low risk: changes are limited to lint tooling/config and small formatting-only edits, with no runtime logic modifications.

Overview
Migrates npm/react from legacy .eslintrc/.eslintignore to an ESLint 9 flat config (eslint.config.ts) that extends @packages/eslint-config, adds package-specific rule overrides, and configures TS projectService plus Cypress globals for cypress/**.

Updates npm/react/package.json to use eslint directly for lint, adds required devDependencies (@packages/eslint-config, eslint, jiti), and introduces a local lint-staged hook; also marks npm/react as completed in guides/eslint-migration.md and includes minor auto-fix formatting in a couple of Cypress component test files.

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Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

[cypress]

cypress    Run #69226

Run Properties:   Passed #69226  •  1b39f23574: updates

Project	cypress
Branch Review	npm-react-eslint-migration
Run status	Passed #69226
Run duration	09m 45s
Commit	1b39f23574: updates
Committer	Jennifer Shehane
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	2
Skipped	0
Passing	260
View all changes introduced in this branch ↗︎

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Warning

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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